We want to provide a comprehensive resource for the multuple research communities that deal with preferences, including computational social choice, recommender systems, data mining, machine learning, and combinatorial optimization, to name just a few.

Please see the about page for information about the site, contacting us, and our citation policy. We rely on the support of the community in order to grow the usefulness of this site. To contribute, please contact Nicholas Mattei at: nicholas{dot}mattei@nicta.com.au

Happy Summer All! We have uploaded a bevy of new data sets including AAMAS 2016 bidding data and some social network data. The updates are coming a bit slower and if anyone out there wants to help Nick maintain the site, golly, he sure could use your help!

Jan. 10, 2017:

Happy New Year all! A few quick updates on the
site.

Nick has moved to IBM! Please note the updated addresses for getting in contact (nsmattei@gmail.com).

We'll be back later in the month with some new datasets and a few other announcements.

June 10, 2016:

Happy summer (and winter down under!). We have had a few typo fixes in the AAMAS dataset, and added two new election datasets! There has also been some fun refactoring going on with the PrefLib tools so head over to GitHub! for more on that.

Dec. 23, 2015:

Happy Holidays from Nick! We have added over 70,000 new data sets to the site in the last couple of days! These include real elections, bidding data from various conferences, and data from other real world preference domains. This brings our total database size up to 5 GB!

In other news I completely overhauled the backend of the site (the part no one sees) and put the code up on GitHub! There has also been a small update to the PrefLib Tools, we have added a bunch of new papers to the links page as well as links to all the iterations of the EXPLORE conference.

Release of PrefLib v. 1.6, incorporating a substantial update of the library with 5 new data sources, many thanks to J-F Laslier. There have been a few small bug fixes files from data sets ED-00015 and ED-00018.

Massive site update sees a revamp of the top menu and the addition of the Archive page.

We have added over 1,000 new data sets from over 10 new sources -- bringing the total library size to over 4,000 files! We have also revamped the data pages to make them easier to navigate. A small change to the file extensions has been made for more clarity.

Finally there is a small update to the Tools library inclding a command line interface and functions to test for Single Peakedness.